Paul Rogers created IMPALA-7755:
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Summary: IS [NOT] DISTINCT FROM rewrite rules don't handle
aggregates
Key: IMPALA-7755
URL: https://issues.apache.org/jira/browse/IMPALA-7755
Project: IMPALA
Issue Type: Bug
Components: Frontend
Affects Versions: Impala 3.0
Reporter: Paul Rogers
Assignee: Paul Rogers
Testing revealed one issue and one limitation of the {{IS [NOT] DISTINCT FROM}}
optimizations in {{SimplifyDistinctFromRule}}.
The rule can simplify {{sum(id) <=> sum(id)}} to {{false}}. But, according to
IMPALA-5125, the rewrite cannot be applied if it would remove the only
aggregate. This is a bug.
A simplification is missing: {{id IS DISTINCT FROM NULL}} → {{id IS NOT
NULL}}.
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